/*
 * Copyright 2019 Google LLC.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package com.google.cloud.tools.jib.hash;

import java.io.IOException;
import java.io.OutputStream;

/**
 * As a function, writes some contents to an output stream. As a class, represents contents that can
 * be written to an output stream. This may be "unrealized-before-write" contents; for example, a
 * file may be open and read for input contents only when this function is called to write to an
 * output stream.
 */
@FunctionalInterface
public interface WritableContents {

  void writeTo(OutputStream outputStream) throws IOException;
}
